Fission: Ruby Environment

This is the Ruby environment for Fission.

It's a Docker image containing a Ruby 2.6.1 runtime. The image uses Rack with WEBrick to host the internal web server.

The environment works via convention where you create a Ruby method called handler with a single optional argument, a Fission::Context object.

The Fission::Context object gives access to the Rack env, a request object, and a logger. Please see fission/context.rb for the public api.

The Fission::Request object is a subclass of Rack::Request and provides access to parameters and headers. See fission/request.rb for the public api.

Looking for ready-to-run examples? See the Ruby examples directory.

Customizing this image

To add package dependencies, edit Gemfile to add what you need, and rebuild this image (instructions below).

Rebuilding and pushing the image

You'll need access to a Docker registry to push the image: you can sign up for Docker hub at hub.docker.com, or use registries from gcr.io, quay.io, etc. Let's assume you're using a docker hub account called USER. Build and push the image to the the registry:

   docker build -t USER/ruby-env . && docker push USER/ruby-env

Using the image in fission

You can add this customized image to fission with "fission env create":

   fission env create --name ruby --image USER/ruby-env

Or, if you already have an environment, you can update its image:

   fission env update --name ruby --image USER/ruby-env

After this, fission functions that have the env parameter set to the same environment name as this command will use this environment.